Southern Pacific Railroad began with a simple idea: to connect San Francisco and San Diego, California, by rail. A century later, Southern Pacific had become one of the largest railroads in America, with lines that stretched from coast to coast (connecting to New York via Morgan Line steamships) and from the south to the northwest. In 1959, SP moved more ton-miles of freight than any
other U.S. railroad. Engines featured here reach back to the era of SP steam, and forward to the diesels of the 1970s.